Armor Class
22
natural structural plating, city-reinforced
Hit Points
615
(30d20 + 300)
Speed
STR
30
(+10)
DEX
3
(-4)
CON
30
(+10)
INT
18
(+4)
WIS
20
(+5)
CHA
22
(+6)
Saving Throws
STR +29, DEX +1, CON +38, INT +26, WIS +28, CHA +30
Skills
Deception +15, Perception +14
Damage Immunities
Acid, Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Condition Immunities
Blinded, Charmed, Deafened, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned, Prone, Restrained, Stunned
Senses
Tremorsense 5 miles, Truesight 1 mile, Passive Perception 24
Languages
Telepathy extends to 5 miles outside of the city walls
Challenge
30 (155,000 XP)
Proficiency Bonus
+9
Traits
Absolute Urban False Appearance: The entire city zone functions under a permanent, unshakeable sensory illusion. Buildings, cobblestones, magic detectors, and inhabitants register as entirely normal to all senses, spells, and divination magic short of a Wish spell or divine intervention.
Metropolitan Ground Tether: Every pseudo-citizen, guard, and street structure is physically connected to the main organism via microscopic sub-surface fibers. If a pseudo-citizen is completely lifted off the ground (e.g., via Levitate or flight), they instantly go limp, collapsing into a slack puddle of loose mimic tissue.
The Outer Tooth-Wall: The perimeter of the city is enclosed by a towering stone wall that is structurally identical to impenetrable fortifications. In reality, it is an interlocking ring of colossal bone-hard mimic teeth. During a feeding cycle, this wall contracts inward.
Regional Dead Zone: No vegetation, grass, or natural plant life can grow within 100 feet of the city mimic or its outer walls. The surrounding earth is barren, grey, and completely dead.
When the city mimic initiates its feeding cycle, it triggers a 24 to 72-hour countdown of escalating earthquakes. Once the countdown expires, the Final Hour begins:
The 1-Hour Collapse: Buildings begin to crumble, terrain breaks apart, and the outer tooth-walls relentlessly close inward toward the center.
The Well Core (The Weak Spot): The heart of the city mimic is located at the bottom of the municipal well, submerged in a deep pool of neutralized, highly corrosive digestive acid.
Destroying the Heart: The heart has AC 18 and 300 Hit Points, along with immunity to all damage except Force and Radiant. While the heart is attacked, the city will funnel all its remaining structural shifts, puppet swarms, and hazards to defend the well. If the heart is destroyed before the 1-hour countdown ends, the city dies instantly, its structures collapsing into safe, inert organic ruins.
Actions
Multiattack: The city mimic can manifest three catastrophic urban disruptions or targeted strikes across its metropolitan body on its turn.
Rupturing Infestation (Recharge 5–6): The mimic forces 1d4 infested humanoids within the city to violently rupture. A wave of internal mimic colonies bursts outward in a 20-foot radius from each target. Each creature in those areas must make a DC 22 Dexterity saving throw, taking 45 (10d8) piercing and acid damage on a failed save, or half as much on a successful one.
Alleyway Devour (Recharge 6): The walls of a targeted alley or street snap inward like a closing jaw. Each creature in a 30-foot straight line must make a DC 25 Strength saving throw. On a failure, a creature takes 55 (10d10) piercing damage and is swallowed/grappled inside the city's internal chambers (escape DC 24).
Legendary Actions
The city mimic can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The city mimic regains spent legendary actions at the start of its turn.
Shift District: The layout of the city alters. A street lengthens, a building rotates 90 degrees to block an escape route, or a stone bridge retracts into a chasm. Creatures must make a DC 20 Dexterity saving throw or fall prone as the ground jolts.
Deploy Puppet: The mimic animates or repositions 1d6 pseudo-citizens or guards into an empty square adjacent to the players to block movement or launch a coordinated surprise grapple (+14 to hit, targets are grappled, escape DC 20).
Seismic Pulse (Costs 2 Actions): A violent tremor rocks the city. Every creature of the city mimics choosing that is touching the ground must succeed on a DC 22 Constitution saving throw or take 22 (4d10) force damage and have their concentration broken.
Description
Appearing to weary travelers as a bustling, prosperous hub of commerce and civilization, the City Mimic is in truth a gargantuan apex predator that has spent centuries cultivating an entire ecosystem across its colossal, camouflaged hide. It feeds by inviting civilizations to build upon its back, slowly weaving its microscopic fibers into the foundations of every street, building, and citizen until the city and the monster are indistinguishable. When its hunger peaks, the outer walls - a ring of razor-sharp, bone-hard teeth - slowly contract while violent tremors herald a catastrophic final hour, sealing the doom of everyone inside unless brave heroes can plunge into its acidic core and slaughter the pulsing heart buried at the bottom of the well.
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